Analytical approach to dynamics of reverse saturable absorbers

    Authors

    A. Kobyakov; D. J. Hagan;E. W. Van Stryland

    Comments

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    Abbreviated Journal Title

    J. Opt. Soc. Am. B-Opt. Phys.

    Keywords

    OPTICAL-LIMITING PROPERTIES; NONLINEAR ABSORPTION; SINGLE-PULSE; ORGANIC-DYES; MECHANISMS; LIMITERS; LASER; Optics

    Abstract

    We develop an analytical approach to the dynamics of band populations of reverse saturable absorbers modeled by the three-level approximation of the five-level rate equations. We find high-accuracy approximate solutions to these rate equations, taking into account the temporal shape of the incident laser pulse for different regimes of excitation. The results obtained are confirmed by direct numerical integration of the rate equations and are verified by solution of the full system of the rate and the propagation equations. The validity ranges of the approximations are determined. We also prove that for input pulses that are much longer than the lifetime of the first excited state the ground-state depletion obeys the same functional dependence on the input fluence as in the case of rectangular input pulses. The dynamics of the excited states, however, explicitly depends on the pulse shape. We quantitatively estimate the effect of various parameters on the nonlinear absorption coefficient and discuss implementation of the approach by a beam propagation method to reduce the computational time. (C) 2000 Optical Society of America [S0740-3224(00)01711-2].

    Journal Title

    Journal of the Optical Society of America B-Optical Physics

    Volume

    17

    Issue/Number

    11

    Publication Date

    1-1-2000

    Document Type

    Article

    Language

    English

    First Page

    1884

    Last Page

    1893

    WOS Identifier

    WOS:000165234000010

    ISSN

    0740-3224

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